Interchangeable matrix mold



Feb. 28, 1933. BUSH 1,899,258

INTERCHANGEABLE MATRIX MOLD Filed Nov. 4, 192 9 2 Sheets-Sheet 1 INVENTOR @ERT/Y. Ezra/1K.

ATTORNEYJ Feb. 28, 1933. BUSH 1,899,258

INTERCHANGEABLE MATRIX MOLD Filed Nov. 4, 1929 2 Sheets-Sheet 2 INVENTOR {Lamar/Z, Bus/i.

' ATTORNEYJU,

rby'a minimum of fastening means} lihalf of thetire mold. 1

' li' atented, F eb.. 28, 1933; I on ase;

"rm or AKRON; 0310, a CORPORATION 01101110 s m'rmcfimemm MATRIX m m y a 'Y Thisfinventionyrelates tointercha-ngeablei -matrix sectionsforcircular molds and more particularly to :interchan eablegtread formi-in matrices for tir'emol s'.*. i

I eretoforeflin molds of this type j it] has f'been customary to cast the r molds jm vhalves and then after; machiningto the proper size i to engrave them with" mold tread engraving 'machmes. If,*however, the tread design became obsolete the whole mold was genera-11y discarded. Some attempts have been made; to machine out the old-tread and en- "grave in anew tread for alarger size tire.

'arencut: on radial lines as shown'a'tp16 so that the curvature of the mold together with 6 This. method, however, has "a limit -'leads-to-iother difliculties v Y 1 object of the invention is the provision and s also Llar molds. r v a I g r, v

's A more particular object of the invention is to provide; ati're mold with interchange-iable tread forming matrices which-can be readily and quickly changed and yet which; are held securelyand positively in :position "A further object is to reduce the cost of 1' tire forming molds, V y I xTheaboveiandother.objects'of the inven- 1 tion-are attained by the fapparatusillustrated in r the accompanying drawings" and described -,below,-it being understood that the invention is not'limited to the specific embodiment thereof described and shown. v i Inthedrawings; I V

Figure 1 is a sectional'view through a tire mold embodying the inventioni Figure 2 is a partial plan viewof the male 4 Figure 3 is a view of the locking matrix, section taken onthe line 3-3 of Figure 1.- r r "In the gdrawings-v regular cast male and -fe-' Y male-mold halves 10 and 11' are formed with "pchannels 10 and- 11 adapted tolreceive'a 1' tread forming ring. comprising= a plurality.

ofimatrixh sections .12 'and;13.' Mating gsur I .1 fgfaces 14' of 'the 'vmatr'ix sections and 14" of lApplicationtfiled November 4, 1929. Serial No 404,542. 5

the mold halvesf are machined -,to coincide zxwitharcs of radiizswung about edges 15 on J the molds and matrices." Thus when jthe matnx sections are placed inthe mold halves the i'nneredges thereof are brought intocon i iia tact first with the mold; whereupon the sectlons are swung up into lace using the edges 15; as a pivot." The-sur aces 14*, of'the, mold halves and the surfaces .14 ofthe matrix sec- 7 .tions beingof the same radius-willslide 019 each other when the sections pivot about the edges 15.

The abutting edges of the matrix sections the abuttingsections Willholdthe various.

r of interchangeable matrix sections for circu- .-%scctions in place in the mold -much in' the mannerthat stones orthe' like are heldin placein an arch.- It willbe obvious thatthe edges of the last -or f key matrix section and the sections abutting ther'evvi-thineachmold half must be .cut'so that the'keysectioncan be inserted and'removed, thus the edges of the key sections 12v and13 andthe sections abutting therewith are cut: as indicated at 172 The angle of the cuts 17v is such that the key sections 12 a'nd13 can be readily inserted and removed and yet iwhenin' place firmly and positively hold the remaining sections vintlie mold halves; 'Suitablemeans such as 5 screws 18 are employed to holdqthekey sec- 1 'tions in place. r a g Ifit'is found. desirable to change the tread r design in the mold it. is only necessary that the screws 18 be removed; whereupon-the matrix sections will readily fall out. Then w withthe mold halves lyingfiatnewmatrix sections having the desired tread vformation thereoncanbe readily placed inthe moldv halves in abutting relation, theikey; sections 85 7 being put in last-*and'held; in} place by the screws 18'. Itwill thus beseenth'ata mold I need not be'discarded when it is desired to change i the. tread design of'the tire formed (therein, \Molds iformerlyengravedwith a 0- 35 halves, a ringof matrix sections received in plicable to; tire molds itWill be apparent-that wherever circular molds are internally engraved the invention can be employed. ac

cordingly various applications and modifications of'the invention can be resorted towith out departing from the spirit of the inven-' tion or the scope of the appended claims. What is claimed is: i i

and female halves, a ring of tread forming ..:mat1'ix sections received'inchannels in each sections abutting therewith beingcut at an =angle -to permit the ready insertion and -re-, moval ofthe key sections in'the matrix ring, v

7 said matrix rings, thusholdi ng allthematrix of-.lsaid;.mold halves, theabutting edges of thesections in each'mold half being out on radiallinessothat the various sections hold each other inplace, key matrix sections in each of said matrix rings,.the edges of said :key sections and the matrix sections abutting therewith being cut at an angle to permit the ready insertion=and removal ofthe key sections in the matrix ring, and meansfor holding said "key sections in said matrix rings, thus holding all the matrix sections in the '=mold halves. 7

2. "In a. circular mold, -male and female channels in each of said mold'halves, the

abuttingedges ofthe sections in each mold halfgbeing cut on radiallines so thatthelvarioussections hold each other inplace, key matrix secti'ons in each of said matrix rings, the edges of said'keysections and the matrix and -means for holding saidkey sections in sections in the mold'halves.

3. In acircular mold, splithalves,'matrix sections received in channels in each of said mold halves, the abutting edges of the sections in each mold halfbeing cut on radial lines so that the various sections hold each :other inplace, key matrix sections, the edges of said key sections and the matrix sections abutting therewith being cut at an angleto permit the ready insertion and removal of the key sections in the matrix ring, and means forholding said key sections in said matrix rings, thus holding allthe matrix sections in :the mold halves.

4;. In a circular tire curing mold, male and f female'halves', a ring of tread forming lIIfitIlX.

pivoting action, the abutting edges of the sec- 7 tions in each mold half being cut on radial lines so that the various sections hold each other inplace, key matrix sections in each of said matrix rings, the edges of said key sections and the matrix sections abutting therewith being cut at an angle: to permit the ready insertion and removal of the key sections in the matrix ring, and means for holding said key sections in said matrix rings,

thus holdingallthematrixsections iirthe mold halves.

5. In a circular mold having a mold cavity,

inatihghalves provided with channels in 1. In a circular tire curingmold, male the mold cavity, matrix sections in said channels, the abutting edges of all of said matrix :being cut to permit readyinsertion and removal of the key section,.and means for looking said key sections in place.

' 6.. In acircular mold having amold cavity, male and female halves, said halvesi'being formed with circumferential'channe1s in said mold cavity, aiplurality ofmatrix sections adapted to be received in said'channels, a-key matrix section for retaining :theaforesaid matrix sections in place ofeachof saidmold channels, said matrix sections being adapted to berotated into said channels about one edge after the edge is placedthereimsaid channels and said matrix sections being formed with surfaces of the same curvature cut on arcs swung'about theline of pivot of said matrix sections and said mold channels. 7 7; In a circular mold having a mold'cavity,

saidmold beingformed with a circumferential channelin said'mold cavity, a plurality of matrix sections adapted to be re" ceived in said channel, a key matrix section for retaining the aforesaid matrix sections in said mold channel, said matrixsections being adapted to be rotated into said channel about one edge after the edge is placed therein, said channel and said matrix sections being formed with surfaces of the same curvature cut on arcs swung about the line of pivot of said matrix sections and said mold channel.

male and female halves, said halves'being formed with circumferential channels insaid moldcavity, a plurality of matrix sections adapted to be received in said channels, a

- keymatrix section for retaining the aforesaid matrix sections in aplace of each-of said mold channels, said matrix sections being adapted to be rotated in to said channels about oneedge after the-edge is placed" there in, said channels and said'matrix sections 8. In a circular mold having a mold cavity, 120

being formed with surfaces of the same curve ature cut on arcs, swung about the line :of pivot of said matrix sections and said mold;

channels, the abuttin edges of all of sai matrix sections but t e key sections being cut on radial lines so the various sections hol 1 I each other in place, the e of said ke seco y tions and the sections a utting therewith being cut to permit ready insertiontand removal of the key sections, and means for locking said key sections in place;

ALBERT: A; BUSH.-. 

